Vocal frequencies, impulse frequencies

Previously, dial phones composed numbers using a gear wheel that created micro contacts at each tooth that passed over an electrical contact (I'm simplifying). For example, when I dialed the number 8, I turned the dial to 8 and upon releasing the dial, a gear wheel would send 8 pulses. With the advances in electronics, the good old gear dial has been replaced by an electronic circuit that, when you pressed the 8 button, electronically sent 8 pulses down the line; these were the first push-button phones, referred to as "pulse dialing" phones. Since then, electrical pulses have been replaced by "musical notes" of different frequencies, which differ depending on whether I press the 8 or 3 button on my phone. This is why we talk about voice frequency in this case. That being said, quite a few models of phones are capable of using both dialing modes: pulse or tone, simply because in some countries or regions, voice frequencies are not yet in use. I therefore recommend checking the documentation for your phones, and you will find a section "pulse or tone mode." From there, you can choose the tone frequency mode. On some phones, by removing the cover, you may find a small switch on the circuit board that allows you to make this choice. Have a good evening.